package com.i1314i.reportsystem.utils.images;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

import java.io.*;

/**
 * @author 平行时空
 * @created 2018-09-28 19:31
 **/
public class Base64Utils {
    /**
     * @Description: 将base64编码字符串转换为图片
     * @Author:
     * @CreateTime:
     * @param imgStr base64编码字符串
     * @param path 图片路径-具体到文件
     * @return
     */
    public static boolean generateImage(String imgStr, String path) {
     if (imgStr == null)
        return false;
    BASE64Decoder decoder = new BASE64Decoder();
    try {
        // 解密
        byte[] b = decoder.decodeBuffer(imgStr);
        // 处理数据
        for (int i = 0; i < b.length; ++i) {
            if (b[i] < 0) {
                b[i] += 256;
            }
        }
        OutputStream out = new FileOutputStream(path);
        out.write(b);
        out.flush();
        out.close();
        return true;
    } catch (Exception e) {
        return false;
    }
    }

    /**
     * @Description: 根据图片地址转换为base64编码字符串
     * @Author:
     * @CreateTime:
     * @return
     */
    public static String getImageStr(String imgFile) {
        InputStream inputStream = null;
        byte[] data = null;
        try {
            inputStream = new FileInputStream(imgFile);
            data = new byte[inputStream.available()];
            inputStream.read(data);
            inputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        // 加密
        BASE64Encoder encoder = new BASE64Encoder();
        return encoder.encode(data);
    }

    /**
     * @Description: 根据图片地址转换为base64编码字符串
     * @Author:
     * @CreateTime:
     * @return
     */
    public static String getImageStr(File imgFile) {
        InputStream inputStream = null;
        byte[] data = null;
        try {
            inputStream = new FileInputStream(imgFile);
            data = new byte[inputStream.available()];
            inputStream.read(data);
            inputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        // 加密
        BASE64Encoder encoder = new BASE64Encoder();
        return encoder.encode(data);
    }
}
